Two days ago I lost one of my chicks. We didn't know for sure what got it but we discovered after they had been out free ranging in our yard and the vacant neighbors yard that one of them one missing. A neighbor also happened to be looking for his dog that was lost and told us he had kicked up a fox just down the street from us. So we have been keeping our girls in their pen and only let them out if we were right there with them. I just stepped out outside after supper and my husband was already out there and we heard this eerry screaming sound. I told him to hurry toward the chicken house. I had let them out just in their fenced yard. They were fine but it had started raining and over in our neighbors yard a rabbit had been sitting and when it started to rain it went toward the bushes for cover and my husband saw the fox had it and ran away when he saw my husband. I am sure he probably got my girl the other day and was waiting for more. My girls won't be going out anymore like that. Their coop is secure. We have regular house doors on it and there is hardware cloth over the windows and windows themselves go in and out and right now we are keeping them in. There is a pane out of one for ventilation. The floor is wood and there are no holes as this coop was just built. Rick said fox are really smart so what is going to be the best way to catch it or them?